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Q.

Sound energy received per second per unit area is called_

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a

Loudness

b

Pitch

c

Intensity

d

Frequency

answer is C.

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Detailed Solution

Sound energy received per second per unit area is called intensity.
Intensity is defined as the amount of sound energy that passes through a unit area in unit time. It determines the loudness of the sound wave. The unit of intensity of sound is

\frac{w}{m^{2}}

. Joules, which are units of work or energy, are used to measure it. It is a quantity that can be measured using audio equipment. The ratio of their powers can be used to compare one intensity to another, but the frequencies must match. The intensity difference is known as

1 Bel

when the ratio is

10

. It bears Alexander Graham Bell's name, a notable American inventor.

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